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Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2017-12-31","val":0,"accn":"0001652133-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":1654000,"accn":"0001652133-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"},{"end":"2019-12-31","val":838000,"accn":"0001652133-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"},{"end":"2020-12-31","val":3003000,"accn":"0001652133-21-000012","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-08","frame":"CY2020Q4I"}]}},"PurchaseObligationDueInFifthYear":{"label":"Purchase Obligation, to be Paid, Year Five","description":"Amount of purchase arrangement to be paid in fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2017-12-31","val":0,"accn":"0001652133-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0001652133-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"},{"end":"2019-12-31","val":0,"accn":"0001652133-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"},{"end":"2020-12-31","val":601000,"accn":"0001652133-21-000012","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-08","frame":"CY2020Q4I"}]}},"PurchaseObligationDueInFourthYear":{"label":"Purchase Obligation, to be Paid, Year Four","description":"Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2017-12-31","val":1200000,"accn":"0001652133-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":402000,"accn":"0001652133-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"},{"end":"2019-12-31","val":0,"accn":"0001652133-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"},{"end":"2020-12-31","val":738000,"accn":"0001652133-21-000012","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-08","frame":"CY2020Q4I"}]}},"PurchaseObligationDueInNextTwelveMonths":{"label":"Purchase Obligation, to be Paid, Year One","description":"Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2017-12-31","val":373000,"accn":"0001652133-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":2948000,"accn":"0001652133-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"},{"end":"2019-12-31","val":3600000,"accn":"0001652133-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"},{"end":"2020-12-31","val":3672000,"accn":"0001652133-21-000012","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-08","frame":"CY2020Q4I"}]}},"PurchaseObligationDueInSecondYear":{"label":"Purchase Obligation, to be Paid, Year Two","description":"Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2017-12-31","val":400000,"accn":"0001652133-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":2481000,"accn":"0001652133-19-000013","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"},{"end":"2019-12-31","val":2759000,"accn":"0001652133-20-000010","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-27","frame":"CY2019Q4I"},{"end":"2020-12-31","val":1962000,"accn":"0001652133-21-000012","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-08","frame":"CY2020Q4I"}]}},"PurchaseObligationDueInThirdYear":{"label":"Purchase Obligation, to be Paid, Year Three","description":"Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. 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